Dưới tác dụng của bức xạ \(\gamma\), hạt nhân \(^9_4Be\) có thể tách thành hai hạt nhân \(^4_2He\) biết mBe=9,0122u, mHe=4
,0015 . mn=1,0087u.để phản ứng trên xảy ra thì bức xạ Gamma phải có tần số tối thiểu la bao nhiêu?
A.2,687.\(10^{20}\) B.1,58.\(10^{20}\) C .4,02.\(10^{20}\) D.1,33.\(10^{20}\)
Câu 1:
Cho M = 1+3+3^2+3^3+3^4+...+3^99+3^100. Tìm số dư khi chia M cho13, Chia M cho 14
Câu 2:
Cho A= 4^0+4^1+4^2+...+4^2016
Câu 3:Tìm x và y biết
/x/+/y/=25
Câu 1: Câu hỏi của masrur chỉ có số dư khi chia M cho 13 nhưng bạn áp dụng thêm để ra M chia cho 14
Câu 2: Đề thiếu
Câu 3: Đề không tồn tại
giúp mình với ạ và cho mình câu giải thích vì sao ra đáp án câu 2, 3, 4 với ạ:
1, Many people are ............. after that earthquake. (HOME)
2, He worked very hard but he could...........feed his family. (HARD) cho mình câu giải thích vì sao ra.
3, She was given........for a three-month visit to Asia.(PERMIT) cho mình câu giải thích vì sao ra.
4, He is thinking of taking early............next year.(RETIRE) cho mình câu giải thích vì sao ra.
5, These workers got a bonus because they did their jobs............(EFFECT)
6, You can never be sure what he is going to do. He is so.........(PREDICT)
7, You can see her.........on her face. She passed the examination with good results.(SATISFY)
8, The church was damaged in the war but it has now been............(BUILD).
9, The thing I don't like much about Kate is her............(RELY).
10, It is becoming......... obvious that changes will have to take place. (INCREASE).
giúp mình với ạ và cho mình câu giải thích vì sao ra đáp án câu 2, 3, 4 với ạ:
1, Many people are homeless after that earthquake. (HOME)
2, He worked very hard but he could hardly (khó lòng mà) feed his family. (HARD) cho mình câu giải thích vì sao ra.
3, She was given permission (sự cho phép) for a three-month visit to Asia.(PERMIT) cho mình câu giải thích vì sao ra.
4, He is thinking of taking early retirement (nghỉ hưu) next year.(RETIRE) cho mình câu giải thích vì sao ra.
5, These workers got a bonus because they did their jobs effectively (EFFECT)
6, You can never be sure what he is going to do. He is so unpredictable (PREDICT)
7, You can see her satisfaction on her face. She passed the examination with good results.(SATISFY)
8, The church was damaged in the war but it has now been rebuilt (BUILD).
9, The thing I don't like much about Kate is her reliance (RELY).
10, It is becoming increasingly obvious that changes will have to take place. (INCREASE).
1. Homeless
2. Hardly ( adv ) : hầu như không ( từ này dùng trong câu khẳng định )
3. Permission (n) ( give permission for sb/st : cho phép ai/cái gì)
4. Retirement (n) : sự nghỉ hưu
5. Effectively
6. Unpredicted
7. Satisfaction
8. Rebuilt
9. Unreliability
10. Increasingly
Cho hỏi những câu không có dấu hiệu nhận biết thì mình dựa vào đâu để chia thì?
Như câu thì htht: We have bought a new lamp.
He has written five letters.
dựa vào V để bt như htht đứng sau S có has/have+Vp2 đó bn
-Viết lại câu vs từ cho sẵn:
1 He doesn't find it hard to make new friends (DIFFICULTY)
2 I'm glad smoking is prohibited on public transport (ALLOWED)
3 He lost his job because he couldn't do what was reqired (INABILITY)
4 He has had enough of the neighbour's noise (PUT)
1.He has no difficulty in making new friends
2.I'm glad that smoking is not allowed on public transport
3.He lost his job because of his inability in doing what was required
4.He can't put up with the neighbor's noise anymore
1) He has no difficulty in making new friends.
2) I'm glad that smoking is not allowed on public transport.
3) He is inability in the job [so he lost his job].
4) He can't put up with the neighbour's noise anymore.
đặt câu hỏi :
1, he never eats meat
2, he cuts his hair short
3, he driver carelessly
4, he is cooking in the kitchen
5, he wants some flowess
1. How often does he eat meat?
2. How does he cut his hair?
3. How is he driver?
4. Where is he cooking?
5. What does he want?
1, How often does he eat meat ?
2, How does he cut his hair ?
3, How does he driver ?
4, Where is he cooking ?
5, What does he want ?
Here is some information about Jack when he was a child.
1/Once he fell into the river
2/ He cried on his first day at school.
3/Once he was bitten by a dog.
4/He scaried a cat when he was 5.
He can still remember 1,3 and he can't remember 2.4. Write sentences beginning : He can remember..... or He can't remember
(ai đó giúp mình làm câu 2 nha . Mấy câu kia mình làm được rồi .Cảm ơn mấy bạn!!!
Okay ;v mình treo hoc24 được thời gian rồi =)) hnay vào lại thấy câu này,, mình lí luận thử coi có đc ko nhé :)
Here is some information about Jack when he was a child.
1/Once he fell into the river
2/ He cried on his first day at school.
3/Once he was bitten by a dog.
4/He scaried a cat when he was 5.
Cái clue để viết vấn đề này là : He can still remember 1,3 and he can't remember 2.4.
=> Câu 1,3 viết theo cấu trúc remember + V_ing (qk) như thường lệ.
=> Câu 2,4 : vì bạn này vẫn không nhớ hai điều này => đã không nhớ thì không chắc 2 điều này có xảy ra hay không, mình nghĩ nên viết với cấu trúc He can't remember if/whether he ....
Vậy viết như sau :
1/Once he fell into the river
=> He can remember falling into the river (when he was a child).
2/ He cried on his first day at school.
=> He can't remember if/whether he had cried on his first day at school or not.
3/Once he was bitten by a dog.
=> He can remember being bitten by a dog (when he was a child).
4/He scaried a cat when he was 5.
=> He can't remember if/whether he had scaried a cat when he was 5 or not.
Vậy nhé :) nếu có sai chỗ nào thì bình luận ở dưới, mình sẽ sửa lại sau :))
Chúc bạn học tốt :))
1. He can remember falling into the river.
2. He can't remember crying on his first day at school.
3. He can remember being bitten by a dog.
4. He can't remember scaring a cat when he was 5.
1. Alcohol is bad for you and so are cigarettes.
\(\Rightarrow\) Both.......
2. He didn’t hurry, so he missed the bus.
\(\Rightarrow\) If.......
*Cho hỏi có ai biết công thức làm câu trần thuật hông vậy? Chỉ mình với!!
1. Alcohol is bad for you and so are cigarettes.
⇒ Both..alcohol and cigarettes are bad for you.....
2. He didn’t hurry, so he missed the bus.
⇒ If....he was hurry, he wouldn't miss the bus...
